* clutter/clutter-timeline.h:
* clutter/clutter-timeline.c: Add a "started" and a "paused"
signals; add more sanity checks on the public functions.
(clutter_timeline_get_loop): Add a getter function for the
loop property.
* clutter/clutter-marshal.list: Add marshallers.
* clutter/clutter-timeline.h:
* clutter/clutter-actor.h: Add padding for future expansion
without breaking ABI.